Invention Grant
- Patent Title: Surface acoustic wave device and duplexer and communication device using the same
- Patent Title (中): 表面声波装置和双工器及通信装置使用相同
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Application No.: US12078232Application Date: 2008-03-28
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Publication No.: US07659796B2Publication Date: 2010-02-09
- Inventor: Masayuki Funami , Takeshi Takenoshita , Yuuko Yokota
- Applicant: Masayuki Funami , Takeshi Takenoshita , Yuuko Yokota
- Applicant Address: JP Kyoto
- Assignee: Kyocera Corporation
- Current Assignee: Kyocera Corporation
- Current Assignee Address: JP Kyoto
- Agency: Bacon & Thomas, PLLC
- Priority: JP2007-084509 20070328
- Main IPC: H03H9/54
- IPC: H03H9/54 ; H03H9/64 ; H03H9/70

Abstract:
A surface acoustic wave device includes a first surface acoustic wave filter forming a ladder filter circuit; and a second surface acoustic wave filter having a passband at a frequency range higher than that of the first surface acoustic wave filter. The first surface acoustic wave filter includes a series-arm surface acoustic wave resonator, a parallel-arm surface acoustic wave resonator and an additional surface acoustic wave resonator. The series-arm surface acoustic wave resonator is on a series arm of the ladder filter circuit and includes an IDT electrode. The parallel-arm surface acoustic wave resonator is on a parallel arm of the ladder filter circuit and includes an IDT electrode. The additional surface acoustic wave resonator includes an IDT electrode, is connected in parallel with the series-arm surface acoustic wave resonator, and has a resonance frequency higher than the frequency range of the passband of the second surface acoustic wave filter.
Public/Granted literature
- US20080238572A1 Surface acoustic wave device and duplexer and communication device using the same Public/Granted day:2008-10-02
Information query
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